| Soil Squad CIC | St. Albans | 2024 |
| Soil Wealth Ltd | Cardiff | 2019 |
| Soilandleaf Ltd | Nottingham | 2026 |
| Soilessentials Limited | Brechin | 2000 |
| Soilplan Ltd | York | 2023 |
| Soilpoint Humic Co., Ltd. | Chatteris | 2022 |
| Soilsense Ltd | Northwich | 2019 |
| Soiltech Systems Ltd | Belfast | 2021 |
| SOK Agri Ltd | Ballymena | 2025 |
| SOK Farms Ltd | Belfast | 2026 |
| SOL Fresh Limited | Southport | 1994 |
| Solabee Ltd | London | 2020 |
| Solace Equestrian Ltd | Longton | 2022 |
| Solana Seeds United Kingdom Ltd | Cromer | 2015 |
| Solanum Solutions Limited | Perth | 2014 |
| Solar 2 Food Ltd | St Athan Airfield | 2020 |
| Solar 2020 Limited | Leicester | 2020 |
| Solar Grow Limited | Chatham | 2014 |
| Solara Energy Limited | London | 2014 |
| Solario Limited | South Molton | 2012 |
| Solaris Biolabs Ltd | Norwich | 2024 |
| Solarius UK & Overseas Limited | Cardiff | 2018 |
| Solarponics UK Limited | St. Albans | 2016 |
| Solarstar Aquatic Furniture Ltd | Farnham | 2021 |
| Solbury Poultry Limited | Haverfordwest | 2020 |
| Soldado Limited | Edinburgh | 2023 |
| Soldy Fishing Ltd | Fraserburgh | 2018 |
| Solen Stewardship Limited | Market Drayton | 2025 |
| Solencia Gundogs Ltd | Newport | 2026 |
| Solendrick Ltd | Doncaster | 2020 |
| Soleni Systems Ltd | Stockton-On-Tees | 2026 |
| Solent Adventures Limited | Southampton | 2025 |
| Solent Agricultural Services Ltd | Lymington | 2023 |
| Solent Seafood Limited | Salisbury | 2017 |
| Solent Tiresome Ltd | Nr Salisbury | 2018 |
| Soles Hill Farm Limited | Faversham | 1982 |
| Solfresh Nurseries Limited | Southport | 1997 |
| Solhampton Fishery Ltd | Stouport On Severn | 2023 |
| Soli-Tree Arborist Limited | Bournemouth | 2025 |
| Solid 69 Ltd | Macduff | 2026 |
| Solidedhe Ltd | Glasgow | 2026 |
| Solihull Paws Ltd | Sutton Coldfield | 2018 |
| Solinger Farm Enterprises Limited | Great Missenden | 2021 |
| Solland Orchard Partnership Ltd | Okehampton | 2023 |
| Solleys Farms Limited | Deal | 2010 |
| Solo Sun Limited | Shetland | 2018 |
| Solomons Farm Ltd | Exeter | 2024 |
| Soloms Court Wine Estate Ltd | Banstead | 2021 |
| Solsgirth Home Farm Ltd | Dollar | 2022 |
| Solstice Equestrian Limited | Wenvoe | 2023 |
| Solstice Nurseries | Banchory, Devenick | 2004 |
| Solton Manor Farm Ltd | Dover | 2020 |
| Solusa Limited | London | 1997 |
| Soluteq Bioplastics Limited | Scunthorpe | 2022 |
| Solution Spot Company Ltd | Belper | 2025 |
| Solvein Holdings Limited | Abingdon | 2021 |
| Solvein Limited | Oxon. | 1989 |
| Solway Free Range Eggs Limited | Dumfries | 2016 |
| Solway Pest Control Limited | Annan | 2023 |
| Solway Salmon Management Limited | Dumfries | 1993 |
| Solway Seafoods Ltd | Annan | 2023 |
| Solynta UK Limited | Norwich | 2019 |
| SOM Vision Ltd | Bristol | 2024 |
| Somarvest Ltd | London | 2025 |
| Somborne Estate Limited | Whitchurch | 2008 |
| Somborne Partnership Ltd | Southampton | 2021 |
| Somborne Services Ltd | Stockbridge | 2005 |
| Somer Valley Woodlands Ltd | Radstock | 2016 |
| Somerford Park Farm Limited | Congleton | 2018 |
| Somersall Hall Estate Limited | Chesterfield | 2015 |
| Somerset Agri Services Ltd | Axbridge | 2026 |
| Somerset Chilli Garden Ltd | Weston-Super-Mare | 2020 |
| Somerset Equine Water Treadmill and Rehabilitation Ltd. | London | 2025 |
| Somerset Farm (East Anglia) Ltd | Wisbech | 2012 |
| Somerset Farm Limited | Crewkerne | 2016 |
| Somerset Timber Services Ltd | Taunton | 2013 |
| Somerset Tree and Landscaping Ltd | Cardiff | 2026 |
| Somerset Wildlife Services Ltd | Bristol | 2025 |
| Somerset Willow Growers Limited | Bridgwater | 2006 |
| Somersets Lake Ltd | Worthing | 2013 |
| Somerton Sporting Club Limited | London | 2014 |
| Somerwood Limited | Telford | 2019 |
| Something Different Miniature Farm C.I.C. | Cullompton | 2021 |
| Sompting Stables Ltd | Worthing | 2022 |
| Sonas Farm Services Ltd | Hereford | 2024 |
| Sondra Fishing Company Ltd | Lerwick | 2020 |
| Sonesta Investment Company Limited | Boston | 2015 |
| Songline Ltd | Gillingham | 2025 |
| Sonop Limited | Bude | 1956 |
| Sontley Farms Limited | Wrexham | 2002 |
| Sonya Fishing Company Limited | Shetland | 2014 |
| Soozoo Limited | Cheshire | 2018 |
| Sophsdram Pet Services Ltd | Whitchurch | 2025 |
| Sorbaiano Limited | Newton Abbot | 2015 |
| Sorbie Farm Energy Ltd | Ardrossan | 2025 |
| Sorbie Farm Ltd | Ardrossan | 2017 |
| Sorbietrees Farm Limited | Somerset | 1981 |
| Sorbus Forestry and Arboriculture Ltd | Perth | 2025 |
| Sorbus Rural Ltd | Newport Pagnell | 2021 |
| Sorbus Tree Services Ltd | Alexandria | 2024 |